Sand-riddling machine.



F. J. HULL.

SAND RIDDLING MACHINE. APPLICATION FILED JULY 12-, 1910.

Patented Mar. 16, 1915.

WITNESSES:

ATTOR EY THE NORRIS PETERS CO. PHOTO-I.ITHO.. wASHIN -TON. D

invrrn STATES Pa T FFKQE.

FOSTER J. HULL, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO NEV] YORK CENTRAL IRON WORKS COMPANY, OF GENEVA, NEW YORK, A CORPORATION OF NEW YORK.

SAND-RIDDLING MACHINE.

Specification of Letters Patent.

Application filed July 12, 1910. Serial No. 571,611.

To aZZ whom it may concern.

Be it known that I, Fos'rnn J. HULL, a citizen of the United States, and residing in the borough of Brooklyn, city of New York, State of New York, have invented certain new and useful Improvements in Sand-Riddling Machines, of which the following is a specification.

My invention relates to machines for riddling or screening sand and the like, and is particularly intended for machines for screening or sifting the sand of sand blast apparatus, molding sand, etc.

As is well known, in riddling or screening sand by hand, the screen or riddle is not merely shaken, from side to side, but is tossed from one hand to the other, and back again, by a peculiar motion which at once shakes the riddle and its contents, and tips the riddle so as to cause the material within it to slide over the screen. This double motion so given the riddle is extremely efficient to cause the finder material to pass through the screen, to avoid clogging of the screen, and to keep the contents of the riddle loose and free-moving. Mere shaking of the riddle from side to side is much less efiicient than this double motion, and does not result in as rapid riddling of the material.

The objects of my invention are, to render riddling machines more rapid and efficient in action, and, to that end, to simulate by machinery the peculiar double motion, above referred to, gi en to the riddle in hand riddling; and to make the machine simple, reliable, compact, and easily operated.

My invention consists in the novel means provided as hereinafter described, for supporting and moving a riddle, sieve, or separator, whereby the motion of hand riddling is closely simulated, and in other features hereinafter described and particularly pointed out in the appended claims.

I will now proceed to describe my invention with reference to the accompanying drawings, which illustrate a sand separator embodying my invention.

In said drawings :Figure 1 shows a side elevation of the separator; Fig. 2 a top view and partial section thereof; and Fig. 3 an end view and partial section thereof.

The machine comprises a riddle, 1, provided with a screen bottom, 2, and supported, by means of lugs 6, on a second riddle or sifter 5, which latter member is also provided with lugs, 7, which engage lugs 6 so as to prevent endwise motion of riddle 1 with respect to riddle 5 during the action of the machine. Riddle 1 is readily lifted off from sifter 5, handles 1- being provided for that purpose. Lugs 6 are so placed on riddle 1 that the screen bottom 2 thereof is normally at a considerable angle with respect to the screen bottom 11 of sifter 5. Between the two screen bottoms, 2 and 11, an inclined baflle plate or shelf 12, is provided, so arranged that material falling through screen 2 upon this baffle will be delivered thereby at the upper end of screen bottom 11. This bail'le 12 is located, within sifter 5, at an angle such that it is always inclined somewhat no matter what may be the inclination of the screen bottom 11 during the operation of the apparatus.

By means hereinafter described, when the machine is in operation, the sifter 5, and with it riddle 1, are moved back and forth and are also given a peculiar tilting motion, closely simulating the motion given to a riddle in hand riddling, and the finer material, which passes through screen bottom 2, as a result of such motion, falls upon baiiie 12 and thence passes down said baflie to the top of screen bottom 11, upon which it is again sifted, the finer material passing through the perforations of the relatively fine sieve 11, (this finer material being, usually, the material which is to be rejected), while the coarser material passes from the lower end of sieve 11 into a trough 13, whence it is delivered into a hopper 50 or other suitable receptacle.

In order that the sifter 5 and riddle 1 may have the desired vibratory and tipping motion, sifter 5 is mounted upon swinging links 14, the latter being pivoted, by means of pivot pins 17 having bearings 18, to the frame of the machine, 16; said sifter 5 being pivoted to these links lei by means of pivots 15. lhe sifter 5, so supported, is capable of being moved forward and back, but if its motion were not otherwise controlled it would be very unstable.

To control and modify the motion of sifter 5, and to give it a tipping or tilting motion about pivots 15, in addition to the to and fro motion it may have by reason of oscillation of links 14, I provide arms 19, con- ,nected at one end to sifter 5, and mounted at the other end upon cranks upon shaft 22; the said cranks having a relatively moderate throw, adapted to cause arms 19 both to move the sifter 5 forward and back, by the oscillation of links 14, and to tiltsifter 5, (and therefore riddle 1), up and down; whereby the desired compound motion is given both to sifter 5 and to riddle 1 and the contents of both. The arms 19, cranks 20 and shaft 22 further render the sifter 5 stable, since these parts in eii'ect form a further means of support for the sifter, limiting the oscillation thereof about pivots 15.

Suitable means may be provided for rotating shaft 22; I have illustrated for this purpose belt pulleys, 21 and 28, one a tight pulley and the other a loose pulley, and a belt shifter 2 1 for shifting a driving belt (not shown) from the one pulley to the other.

To keep the main body of sand in position on the screen bottom 2 of riddle 1, I provide riddle 1 with a cross bar 8, raised sufliciently above screen bottom 2 to permit particles or objects larger than the perforations of the screen 2 to pass beneath said bar 8; and I have further provided an oblique guide bar 10 for guiding such larger particles or objects to one side of the riddle, after they have passed under bar 8; whence they fall from the riddle 1; and an apron 25 may be provided for guiding such particles and objects away from the machine. If desired, a further apron 26 may be provided, beneath sifter 5, to direct away from the machine the fine dust and sand which passes through the perforations of screen 11.

It has been found that a riddle'or screen to which is imparted the combined vibratory and tilting motion above described, riddles or sifts sand much more rapidly than does a similar riddle or screen to which a mere vibratory motion is imparted, without any material tilting, of the screening surface.

What I claim is:

l. A riddling machine comprising in combination two screen-bottom containers, one above the other, supporting means therefor permitting both vibration of said containers and tilting thereof about a transverse axis, means for so vibrating and tilting said containers arranged to limit the range of both movements of said containers, and Ya baffle between the screen-bottoms of said two containers, inclined to both such screen-bottoms at angles such that it is inclined with'respect to the horizontal in all of the positions of said containers, the said containers and said baffle constituting, as to such motions, a single'structure which moves as a Whole.

2. A machine of the class described comprising in combination a screen-bottom sifter, a removable riddle, likewise having a screen-bottom, the bottoms of the sifter and riddle inclined to one another, means for both vibrating and tilting the sifter, and therefore the riddle, said sifter and riddle provided With engaging lugs, whereby longitudinal motion of the riddle with respect to the sifter during the operation of the machine is prevented.

In testimony whereof, I have signed my name to this specification, in the presence of tWo subscribing witnesses.

FOSTER J. HULL.

Vitnesses:

F. F. CRAMPTON, M. A. BUTLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

